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What alkane effuses at 1/5 the rate of He

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rate He = 5L/sec
rate x = 1 L/sec

5/1 = sqrt(Mx/4)
Mx = ?
Then CH3(CH2)yCH3
CH3 = 15 and 15*2 = 30 for the two ends.
That leaves Mx-30 for the (CH2)y, solve for y to obtain the formula of the alkane.

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